Grainding mill



J. B. SEDBERRY GRINDING MILL l Nov. 10 192s. ,1 1,560,865

Original Filed Nov. 28. 1923 2 Sheets-Sheet 1 i l B. ed/Zn any. S\ 'BY/4MM y,

I A TTORNE YS Nov. 1o, 1925. 1,560,865

J. B. SEDBERRY GRINDING MILL Original Fi1ed`Nov.-28. 1923 2 sheets-sheet 2 Q@ A @OT y Patented Nov. 10, 1925.

JAMES BERNARD SEDIBERRY, OF UTICA, NEW YORK.

GBINDING MILL.

Application led November 28, 1923, Serial No. 677,48L` Renewed April 10, 1925.

To all lwhom t may concern:

Be it known that I, JAMES BERNARD SED- BERRY, a citizen of the United States, and a resident of Utica, in the county of Oneida and State of New York, have invented certain new and useful Improvements in Grinding Mills, of which the following is a specification.

My present invention relates generally to grinding mills of the type described and claimed in my Patent N o. 1,439,581 granted December 19, 1922 wherein grinding elements known as hammers are rotatably'- mounted at the outer ends of supporting links, the latter pivotally connected at their inner ends to disks rotatable with the grindf ingv shaft, the hammers having means cooperating with the links whereby the hammers may change their positions each time the grinding shaft is brought to rest and again rotated, but will be maintained against rotation relative to the supporting links during continuous rotation of the grinding shaft.

My invention in so far as the above general construction is concerned relates particularly to the construction of the hammers themselves and aims to provide a hammer wherein each adjusted position presents a plurality of cutting edges as compared to the single cutting edge presented in each adjusted position .by the hammers in my previously patented construction.

My present invention also relate-s to that type of grinding mill`wherein the ground material is forced through a screen and is caused to be deposited within one end of a Suction conduit, connected at its other endv to the suction-side of a blower or fan casing, the. fan within which serves to draw the material through the suction conduit and thereafter blow such material through a discharge conduit. Along these lines of construction my previously patented construction as well as vario-us other constructions employing the conduit cylindrical or substantially cylindrical throughout its entire length presents certain disadvantages in respect to clogging at that point adjacent to the screen and my present invention proposes a suction conduit which without undesirable competition and without materially adding to the cost of the apparatus as a whole, avoids such disadvantage and insures a uniform effective' action under all conditions of USG.

' showing the same,

With the above in mind my present invention may be better understood from the following description in detail, reference being made to the accompanying drawings, which form a part of this specification and wherein,

Figure 1 is a front view, partly in elevation and partly broken away and in section, showing my improvements,

Figure 2is a side view partly in elevation and partly broken away and in section Figure 3 is a perspective view on a slightly smaller scale, illustrating the complete device,

Figure 4 is a detail perspective view of apair of the hammer supporting links,

Figure 5 is a similar View -of oneof the hammers, and

Figure 6 is an enlarged section taken lengthwise through the upper portion of the wall of the housing. l

Referring now to these figures, the grinding shaft 10 in myv improved apparatus eX- tends transversely through the side walls 11 and is journaled in bearings 12 outwardly beyond the housing side walls 11, one

of which bearings is located adjacent to the inner side wall of the fan or blower casing 13, the latter of which has an upright discharge conduit 14 and receives material from the adjacent end 15 of the suction conduit Y 16 connected axially to the outer lside of the casing 13.

The grinding shaft 10 has beyond the other bearing 12 a pulley 17 by means of which it vmay be belt driven from any suitable sorce of power and, between the side walls 11 of the housing of the grin-der, this .shaft rigidly supports a plurality of similar spaced apart supporting disks 18 adjacent to whose peripheral edges are arcuate series of apertures 19 as seen in Figure 2 for the adjustable pivotal connection of the inner ends of the hammer supporting links 20, the series o-f openings 19 being disposed at circumfereritially spaced points around the disks, for instance ninety degrees apart as shown and the apertures of each series being disposed at dierent distances from the axis of the shaft 10 so thatv with links 20 of the same length, the hammers 21 rotatable at the outer `ends ofthe links, may be effective at points variously spaced with respect to the axis-of the shaft, depending upon the material to be ground.

- Through selecteol apertures 19 of the several disks are extended longitudinal ham mer supporting bolts 22, projecting through the entire series of disks parallel to the grinding shaft, which bolts also project through apertures 23 at the inner ends of the hammer supporting links whose innerends are disposed between the disks 18. The outer ends of these links have apertures 24 for the reception of the hammer pins 25 which also extend through the axial openings 26 of the hammers 21 which latter openings have recesses therearound so that in the rotation of the grinding shaftl the hammers will be held by centrifugal force with the hammer pins 25 in one of the recesses of the hammer openings and the hammers thus prevented from independent rotation with respect to the links until such time as the grinding shaft is brought to'rest| and again started.

Ordinarily it has been the custom to make the hammers 21 square with four cornersI constituting cutting edges but in accordance with my present improvements I cut away the four corners along similar angles and aio along scalloped lines so that in place of each single corner cutting edge my improved hammer presents a series o f cutting edges 27 in each effective position the hammer may assume with respect to the supporting links 2() the result thus being` a generally octagonal hammer, alternate faces of which, form cutting surfaces, each cutting surface having multiple cutting edges located at and between its ends.

The hammers are thus adjustably or shiftably mounted to revolve with the hammer supports including the links 20, disks 18 and grinding shaft 10 and operate between side walls 11 of the grinder housing and within the grinding chamber 28 along the lowei` portion of which a semicylindrical screen 29 is disposed. Curved sections 3() and 31 of the wall of the housing extend above opposite ends of the semicylindrical screen 29, the upper wall 31 extending forwardly above the more acutely inturned wall section 30 so as to provide a receiving throat 32 within which the inner end of the feed table 33 is hingedlv connected as at 34 for the introduction of material within the grinding chamber 28. This table 33 is adjustably supported by braces 35 and .the material fed thereon into the grinding chamber under control of an apron 36 depending above the table from the upper forward end of the upper wall 31 of the housing, falls into the grinding chamber where it is acted upon bv the hammers and the ground material forced through the interstices of the screen 29 and into the lower receiving end 37 of the suction conduit 16, either directly into said suction conduit through that portion whose upper wall is cut away as at 38 between the side walls-11 of the housing, or against inclined discharge plates 39 forwardly and rearwardly of the screen 29 and one of which is seen in the sectioned portion of Figure 2, the lower ends of which discharge plates nroiect into the receiving end 37' of the suction conduit.

In further accordance with my invention the suction conduit` 16 is rectangular in cross section and gradually tapers and flares from its larger upper end 14 connected to the fan orblowercasing 13, to its relatively wide llat receiving end 37, at the extremity of t-he latter of which is a hinged closure A4:0, see Figure 1, which in the closed position shown sucks air downwardly through the grinder 'housing along with material, and which when open permits air to. be drawn directly into the extreme end of the receivingportion -37 of the suction conduit. In this connection it is of considerable advantage to have the suction conduit closed With some materials, for instance very light materials and equally advantageous to have the same open with some materials, for instance heavy materials.

' The shape of the suction conduit has been found to successfully eliminate all danger of clogging and insure uniform action even with the added burden of an increased output of round material brought about through t e use ofthe hammers proposed by my present invention with their multitudinous cutting edges. In the respects mentioned my invention materially improves my previously patented construction as well as other known devices forsimilar purposes and does so without'added complications or material increase in the cost of production.

I claim:

In a grinding mill of the character described, a grinding element including a generally octagonal grinding head having its alternate surfaces provided with a plurality of cutting edges at and between the ends thereof.

JAMES BERNARD SEDBERRY. 

